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Axial-flux electric machine

a technology of axial flux and electric machines, which is applied in the direction of dynamo-electric machines, mechanical energy handling, electrical apparatus, etc., can solve the problems of inconvenient use of conventional direct motor drives, large motors, and large bulkyness

Inactive Publication Date: 2012-08-23
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Emissions from gasoline driven automobiles are one of the main causes of environmental pollution.
If the motor drives the wheel directly, the motor becomes very bulky.
As vehicles need to run at low speed, it is inconceivable to use conventional direct motor drives as they are far too bulky and expensive.
The use of a mechanical gear reduces the motor size, but additional space is needed for the gear.
The mechanical gear also reduces the efficiency of energy transmission.
Its mechanical structure is complex and it runs noisily due to the multiple rotating parts.

Method used

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Embodiment Construction

[0027]The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0028]The present invention relates to an axial-flux-modulated motor (AFMM) for the in-wheel gearless drive of motor vehicle such as HEV. Referring to FIG. 2, the AFMM includes 2 outer rotors 212, 2 sets of elongated iron (ferromagnetic) segments 206, and a stationary stator 208 with windings 210. Each element has the same axis of rotation which may be fixed to a shaft (not shown). The outer rotor 212 includes a plurality of permanent magnets 204 embedded thereon, such as NdFeB magnets, having poles facing radially inwards and outwards, that are orientated with alternating polarity (i.e., north and south poles) so that each of the permanent magnet has its poles facing in the opposite direction to the magnets next to it. The rotors are adapted to rotate relati...

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Abstract

An axial-flux electric motor includes a stator having a plurality of stator windings and a plurality of stator pole-pairs, a first rotor configured to magnetically interact with the stator in an axial direction, the first rotor is positioned on one side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, a second rotor configured to magnetically interact with the stator in the axial direction, the second rotor is position on another side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, and a plurality of stationary ferromagnetic segments, positioned between the stator and the first rotor and between the stator and the second rotor, the ferromagnetic segments are adapted to modulate magnetic field of the permanent magnets in the axial direction.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to magnetic flux-modulation machines, more particularly, to axial-flux modulated motors.[0003]2. Description of the Related Art[0004]Emissions from gasoline driven automobiles are one of the main causes of environmental pollution. One of the solutions to reducing air pollution is to replace motor vehicles with gasoline combustion engine with low-emission vehicles such as hybrid electric vehicles (HEV). For HEV drives, in-wheel electric motors which are mounted in the rear wheel axes have many advantages. For instance, the front wheels and rear wheels form a series-parallel drive without special mechanical coupling between them. The wheels of vehicles run in low speed. The dimension of electric machines is inversely proportional to its running speed. If the motor drives the wheel directly, the motor becomes very bulky. As vehicles need to run at low speed, it is inconceivable to use conventi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K9/02H02K16/02
CPCH02K7/11H02K21/24H02K16/02
Inventor FU, WEINONGHO, SIU-LAU
Owner THE HONG KONG POLYTECHNIC UNIV
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